:root {
  color-scheme: light;
  --ink: #132a34;
  --green: #14644b;
  --line: #d9e3df;
  --paper: #f5f7f3;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font:
    17px/1.6 system-ui,
    sans-serif;
}
header,
main,
footer {
  max-width: 1120px;
  margin: auto;
  padding: 28px;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  gap: 24px;
}
nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
a {
  color: var(--green);
  text-underline-offset: 4px;
}
.logo {
  text-decoration: none;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -1px;
}
.logo span {
  font-weight: 400;
}
h1 {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.12;
  letter-spacing: -1.5px;
}
h2 {
  line-height: 1.3;
}
.hero {
  padding: 55px 0;
  max-width: 740px;
}
.eyebrow {
  letter-spacing: 2px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}
.card,
form,
.lesson {
  background: white;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 26px;
  margin: 20px 0;
}
.badge {
  font-size: 13px;
  background: #e4f0e8;
  padding: 5px 10px;
  border-radius: 20px;
}
button,
.button {
  display: inline-block;
  background: var(--green);
  color: white;
  border: 0;
  border-radius: 8px;
  padding: 11px 18px;
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}
button.secondary {
  background: #e4eee9;
  color: var(--ink);
}
button:disabled {
  opacity: 0.6;
  cursor: wait;
}
input,
select,
textarea {
  display: block;
  width: 100%;
  font: inherit;
  border: 1px solid #829a90;
  border-radius: 6px;
  padding: 10px;
  margin: 5px 0 18px;
}
input[type='checkbox'] {
  display: inline;
  width: auto;
  margin-right: 10px;
}
label {
  display: block;
  font-weight: 600;
}
textarea {
  min-height: 130px;
}
fieldset {
  border: 1px solid var(--line);
  border-radius: 10px;
  margin: 18px 0;
  padding: 18px;
}
form.auth {
  max-width: 520px;
}
#message:not(:empty) {
  padding: 14px;
  border: 1px solid #be775c;
  background: #fff1e9;
  border-radius: 8px;
  margin: 20px 0;
}
.lesson-body {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.lesson {
  max-width: 850px;
}
footer {
  border-top: 1px solid var(--line);
  margin-top: 60px;
  font-size: 14px;
}
.skip {
  position: absolute;
  left: -10000px;
}
.skip:focus {
  left: 12px;
  top: 12px;
  background: white;
  padding: 10px;
}
:focus-visible {
  outline: 3px solid #c18317;
  outline-offset: 4px;
}
.muted {
  color: #526760;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
@media (max-width: 650px) {
  header {
    align-items: flex-start;
    flex-direction: column;
  }
  nav {
    gap: 12px;
  }
  main {
    padding: 20px;
  }
}